| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.cassandra.utils; |
| |
| import java.lang.management.ManagementFactory; |
| import java.util.Collections; |
| import java.util.Set; |
| import java.util.UUID; |
| import java.util.function.Consumer; |
| import javax.management.MBeanServer; |
| import javax.management.MBeanServerFactory; |
| import javax.management.MalformedObjectNameException; |
| import javax.management.ObjectName; |
| import javax.management.QueryExp; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Helper class to avoid catching and rethrowing checked exceptions on MBean and |
| * allow turning of MBean registration for test purposes. |
| */ |
| public interface MBeanWrapper |
| { |
| Logger logger = LoggerFactory.getLogger(MBeanWrapper.class); |
| |
| MBeanWrapper instance = create(); |
| String IS_DISABLED_MBEAN_REGISTRATION = "org.apache.cassandra.disable_mbean_registration"; |
| String DTEST_IS_IN_JVM_DTEST = "org.apache.cassandra.dtest.is_in_jvm_dtest"; |
| String MBEAN_REGISTRATION_CLASS = "org.apache.cassandra.mbean_registration_class"; |
| |
| static MBeanWrapper create() |
| { |
| // If we're running in the in-jvm dtest environment, always use the delegating |
| // mbean wrapper even if we start off with no-op, so it can be switched later |
| if (Boolean.getBoolean(DTEST_IS_IN_JVM_DTEST)) |
| { |
| return new DelegatingMbeanWrapper(getMBeanWrapper()); |
| } |
| |
| return getMBeanWrapper(); |
| } |
| |
| static MBeanWrapper getMBeanWrapper() |
| { |
| if (Boolean.getBoolean(IS_DISABLED_MBEAN_REGISTRATION)) |
| { |
| return new NoOpMBeanWrapper(); |
| } |
| |
| String klass = System.getProperty(MBEAN_REGISTRATION_CLASS); |
| if (klass == null) |
| { |
| if (Boolean.getBoolean(DTEST_IS_IN_JVM_DTEST)) |
| { |
| return new NoOpMBeanWrapper(); |
| } |
| else |
| { |
| return new PlatformMBeanWrapper(); |
| } |
| } |
| return FBUtilities.construct(klass, "mbean"); |
| } |
| |
| static ObjectName create(String mbeanName, OnException onException) |
| { |
| try |
| { |
| return new ObjectName(mbeanName); |
| } |
| catch (MalformedObjectNameException e) |
| { |
| onException.handler.accept(e); |
| return null; |
| } |
| } |
| |
| // Passing true for graceful will log exceptions instead of rethrowing them |
| void registerMBean(Object obj, ObjectName mbeanName, OnException onException); |
| |
| default void registerMBean(Object obj, ObjectName mbeanName) |
| { |
| registerMBean(obj, mbeanName, OnException.THROW); |
| } |
| |
| default void registerMBean(Object obj, String mbeanName, OnException onException) |
| { |
| ObjectName name = create(mbeanName, onException); |
| if (name == null) |
| { |
| return; |
| } |
| registerMBean(obj, name, onException); |
| } |
| |
| default void registerMBean(Object obj, String mbeanName) |
| { |
| registerMBean(obj, mbeanName, OnException.THROW); |
| } |
| |
| boolean isRegistered(ObjectName mbeanName, OnException onException); |
| |
| default boolean isRegistered(ObjectName mbeanName) |
| { |
| return isRegistered(mbeanName, OnException.THROW); |
| } |
| |
| default boolean isRegistered(String mbeanName, OnException onException) |
| { |
| ObjectName name = create(mbeanName, onException); |
| if (name == null) |
| { |
| return false; |
| } |
| return isRegistered(name, onException); |
| } |
| |
| default boolean isRegistered(String mbeanName) |
| { |
| return isRegistered(mbeanName, OnException.THROW); |
| } |
| |
| void unregisterMBean(ObjectName mbeanName, OnException onException); |
| |
| default void unregisterMBean(ObjectName mbeanName) |
| { |
| unregisterMBean(mbeanName, OnException.THROW); |
| } |
| |
| default void unregisterMBean(String mbeanName, OnException onException) |
| { |
| ObjectName name = create(mbeanName, onException); |
| if (name == null) |
| { |
| return; |
| } |
| unregisterMBean(name, onException); |
| } |
| |
| default void unregisterMBean(String mbeanName) |
| { |
| unregisterMBean(mbeanName, OnException.THROW); |
| } |
| |
| enum OnException |
| { |
| THROW(e -> { throw new RuntimeException(e); }), |
| LOG(e -> { logger.error("Error in MBean wrapper: ", e); }), |
| IGNORE(e -> { }); |
| |
| private Consumer<Exception> handler; |
| OnException(Consumer<Exception> handler) |
| { |
| this.handler = handler; |
| } |
| } |
| |
| Set<ObjectName> queryNames(ObjectName name, QueryExp query); |
| |
| MBeanServer getMBeanServer(); |
| |
| class NoOpMBeanWrapper implements MBeanWrapper |
| { |
| public void registerMBean(Object obj, ObjectName mbeanName, OnException onException) {} |
| public void registerMBean(Object obj, String mbeanName, OnException onException) {} |
| public boolean isRegistered(ObjectName mbeanName, OnException onException) { return false;} |
| public boolean isRegistered(String mbeanName, OnException onException) { return false;} |
| public void unregisterMBean(ObjectName mbeanName, OnException onException) {} |
| public void unregisterMBean(String mbeanName, OnException onException) {} |
| public Set<ObjectName> queryNames(ObjectName name, QueryExp query) {return Collections.emptySet(); } |
| public MBeanServer getMBeanServer() { return null; } |
| } |
| |
| class PlatformMBeanWrapper implements MBeanWrapper |
| { |
| private final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| |
| public void registerMBean(Object obj, ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| mbs.registerMBean(obj, mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| } |
| |
| public boolean isRegistered(ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| return mbs.isRegistered(mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| return false; |
| } |
| |
| public void unregisterMBean(ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| mbs.unregisterMBean(mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| } |
| |
| public Set<ObjectName> queryNames(ObjectName name, QueryExp query) |
| { |
| return mbs.queryNames(name, query); |
| } |
| |
| public MBeanServer getMBeanServer() |
| { |
| return mbs; |
| } |
| |
| } |
| |
| class InstanceMBeanWrapper implements MBeanWrapper |
| { |
| private MBeanServer mbs; |
| public final UUID id = UUID.randomUUID(); |
| |
| public InstanceMBeanWrapper(String hostname) |
| { |
| mbs = MBeanServerFactory.createMBeanServer(hostname + "-" + id); |
| } |
| |
| public void registerMBean(Object obj, ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| mbs.registerMBean(obj, mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| } |
| |
| public boolean isRegistered(ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| return mbs.isRegistered(mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| return false; |
| } |
| |
| public void unregisterMBean(ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| mbs.unregisterMBean(mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| } |
| |
| public Set<ObjectName> queryNames(ObjectName name, QueryExp query) |
| { |
| return mbs.queryNames(name, query); |
| } |
| |
| public MBeanServer getMBeanServer() |
| { |
| return mbs; |
| } |
| |
| public void close() |
| { |
| mbs.queryNames(null, null).forEach(name -> { |
| try |
| { |
| if (!name.getCanonicalName().contains("MBeanServerDelegate")) |
| { |
| mbs.unregisterMBean(name); |
| } |
| } |
| catch (Throwable e) |
| { |
| logger.debug("Could not unregister mbean {}", name.getCanonicalName()); |
| } |
| }); |
| MBeanServerFactory.releaseMBeanServer(mbs); |
| mbs = null; |
| } |
| } |
| |
| class DelegatingMbeanWrapper implements MBeanWrapper |
| { |
| MBeanWrapper delegate; |
| |
| public DelegatingMbeanWrapper(MBeanWrapper mBeanWrapper) |
| { |
| delegate = mBeanWrapper; |
| } |
| |
| public MBeanWrapper getDelegate() |
| { |
| return delegate; |
| } |
| |
| public void setDelegate(MBeanWrapper wrapper) |
| { |
| delegate = wrapper; |
| } |
| |
| public void registerMBean(Object obj, ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| delegate.registerMBean(obj, mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| } |
| |
| public boolean isRegistered(ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| return delegate.isRegistered(mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| return false; |
| } |
| |
| public void unregisterMBean(ObjectName mbeanName, OnException onException) |
| { |
| try |
| { |
| delegate.unregisterMBean(mbeanName); |
| } |
| catch (Exception e) |
| { |
| onException.handler.accept(e); |
| } |
| } |
| |
| public Set<ObjectName> queryNames(ObjectName name, QueryExp query) |
| { |
| return delegate.queryNames(name, query); |
| } |
| |
| public MBeanServer getMBeanServer() |
| { |
| return delegate.getMBeanServer(); |
| } |
| } |
| } |